ECS-31
SERIES
LOW FREQUENCY QUARTZ CRYSTALS
The ECS-31 Series features the same
characteristics as only tuning fork crystals
offer. Because of their miniature size they are
ideal for portable and communication
equipment applications.
FEATURES
• Miniature size
• Cost effective
• Long term stability
• Excellent shock and vibration characteristics
PART NUMBERING GUIDE
“EXAMPLE”
MANUFACTURER
ECS
ECS
ECS
–
–
–
FREQUENCY
.400
.400
2.0
–
–
–
LOAD CAPACITANCE
12.5
12.5
12.5
–
–
–
PACKAGE TYPE*
8
13
14
* Package type examples (8=3x8, 13=2x6, 14=1x5)
OPERATING CONDITIONS/ELECTRICAL CHARACTERISTICS
PARAMETERS
FREQUENCY RANGE
FREQUENCY TOLERANCE
FREQUENCY VS. TEMP. CHARAC.
TURNOVER TEMPERATURE
TEMPERATURE COEFFICIENT
OPERATING TEMP. RANGE
STORAGE TEMP. RANGE
EQUIVALENT SERIES RESISTANCE
LOAD CAPACITANCE
MOTIONAL CAPACITANCE
SHUNT CAPACITANCE
CAPACITANCE RATIO
DRIVE LEVEL
INSULATION RESISTANCE
AGING
(FIRST YEAR)
SHOCK RESISTANCE
f
o
∆f/f
o
∆f/f
o
Tm
ß
T
OPR
T
STG
R
1
C
L
C
1
C
0
τ
DL
IR
∆f/f
o
3X8
20KHz ~ 40KHz
±30 PPM
2X6
30KHz ~ 150KHz
±30 PPM
See Drawing
+25˚C typ.
2
-0.034 PPM/˚C typ.
-10 ~ +60
-40 ~ +85
30 ~ 50 (max.)
12.5pF typ. (Customer Specified)
1 ~ 4fF typ.
0.8 ~ 1.7pF typ.
425 ~ 800 typ.
1µW max.
500 MΩ min.
±5 PPM max.
±5 PPM max.
1X5
200KHz
±10,000 PPM
CONDITIONS
KHz
@ +25˚C
-10˚C ~ +60˚C
Varies depending on frequency
10 (max.)
˚C
˚C
KΩ
pF
fF
pF
µW
DC 100V±15
+25˚C ± 3˚C
Conditions will vary
depending on frequency
Drop test of 3 times on a hard board from 75 cm height or shock test of 3000G x 0.3ms x 1/2 sin wave x 3 directions
PACKAGE DIMENSIONS (mm)
1.1
0.45
ø 1.5 Max
PARABOLIC TEMPERATURE CURVE
T (˚C)
-20 -10
0
10
20 30 40 50
-10
-20
-30
-40
60
70
Ø
3.1 Max.
ø 0.35
8.2 Max.
10
5.1 Max.
4.3
ø 0.2
-50
-60
Figure 1) ECS-31-8
0.7
Figure 3) ECS-31-14
f/f (PPM)
ø 2.1 Max
ø 0.26
To determine frequency stability, use parabolic
curvature. For example: What is the stability at 45˚C?
1) Change in T (˚C) = 45 -25 = 20˚C
2
2) Change in frequency = -0.04 PPM x (
∆
T)
2
= -0.04 PPM x (20)
= -16.0 PPM
6.2 Max.
10
Figure 2) ECS-31-13
ECS, INC. INTERNATIONAL
1105 S. RIDGEVIEW, OLATHE, KS 66062 • 913-782-7787 • 800-237-1041 • FAX 913-782-6991 • WWW.ECSXTAL.COM
CRYSTALS
4
CRYSTALS
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